How to get over fear while on a motorcycle?

So I've taken the motorcycle safety class and I have had my license for a year now. I've had my 99 honda rebel 250 for a year as well. I've driving around town( back end roads with little traffic). A few hundreds of time no problems never stall it or dumped it, no problem coming to a stop or taken off. The problem is riding in traffic doing 45+. How do I get over this fear and did you have this fear as well?

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